When you open the script with ahk you should see this window pop up.
https://imgur.com/I4qPCNJ
You can either choose a value or press on the AutoHeal tab (if you do this the default AutoNexus value is 30%) and choose from one of theese values:
https://imgur.com/n1dmr3G
If you dont choose anything from here the autoheal will be turned off.
Then proceed with pressing the OK button.
Then you will see "OFF" sign left of your fame, this means that the autonexus is off.
https://imgur.com/BY7APGK
To toggle it on you need to press CTRL+N and you also toggle it off with the same combination.
https://imgur.com/Rf8TVmk
And thats all folks, I hope you like it.